Immobilization of metal contaminants from a liquid to a solid medium
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United States of America Patent
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Feb 27, 1996
Grant Date -
N/A
app pub date -
May 4, 1994
filing date -
Nov 15, 1991
priority date (Note) -
Expired
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Abstract
A method for the immobilization of heavy metal contaminant from a liquid medium containing sulfuric acid and one or more acids of phosphorus, for example in the treatment of acid raffinates generated during the purification of phosphoric acid. The method includes the steps of (i) neutralizing the liquid medium with a stoichiometric excess of an alkaline earth metal oxide to form agglomerates, and (ii) treating the agglomerates with water to form a solid cementitious material wherein the heavy metal contaminants are substantially chemically isolated.
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